AutoClicker.c

/*
	[1]  - https://docs.microsoft.com/en-us/windows/win32/winprog/using-the-windows-headers
	[2]  - https://www.tutorialspoint.com/c_standard_library/stdio_h.htm
	[3]  - https://www.tutorialspoint.com/cprogramming/c_functions.htm
	[4]  - https://docs.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-input
	[5]  - https://docs.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-mouseinput
	[6]  - https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-sendinput
	[7]  - https://www.tutorialspoint.com/cprogramming/index.htm
	[8]  - https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getasynckeystate
	[9]  - https://docs.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes
	[10] - https://www.tutorialspoint.com/cprogramming/c_decision_making.htm
	[11] - https://www.tutorialspoint.com/cprogramming/c_loops.htm
*/

#include <windows.h>								// [1] Standard windows header
#include <stdio.h>									// [2] Standard input/output header

void ClickLMB()										// [3] Function to press the left mouse button
{
	INPUT input;									// [4] Struct for holding the input data

	input.type = 0;									// [4] Set type to mouse
	input.mi.dwFlags = 2;							// [5] Set action to left down
	input.mi.mouseData = 0;							// [5] Set data to none
	input.mi.time = 0;								// [5] Set time to current

	SendInput(1, &input, sizeof(INPUT));			// [6] Make the input

	input.mi.dwFlags = 4;							// [5] Set action to left up
	Sleep(10);										// [1] Wait 10 milliseconds

	SendInput(1, &input, sizeof(INPUT));			// [6] Make the input
}

int main()											// [7] Main entry point
{
	printf("Hold F10 to click\n");					// [2] Display some text
	printf("Press F12 to stop the program\n");		// [2] Display some text

	while (1)										// [11] Infinite loop
	{
		if (GetAsyncKeyState(VK_F10)) 				// [8][9][10] Test if the F10 key was pressed
		{
			ClickLMB();								// [3] Click the left mouse button
		}
		if (GetAsyncKeyState(VK_F12)) 				// [8][9][10] Test if the F12 key was pressed
		{
			break;									// [11] Leave the loop
		}
	}

	return 0;										// [7] Exit normaly
}